One Cooling Fan Not Working. - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Fondue Wormhole · 07-07-2017, 01:59 PM

One of my cooling fans isn't coming on.

With the engine cold & the AC on, standing at the front of the car and looking in the engine bay, only the right fan comes on. With a coolant temp over 220*'s, only the right fan is on.

I see in the fuse box there are 3 relays: K612 (Mini) Cool Fan HI (HC), K613 (Micro) Cool Fan Low (HC), & K614 Cool Fan CNTRL, as well as 3 fuses: #11 (Mini) Cool Fan Rly (10A), #41 (J-Case) Cool Fan HI (30A), & #44 (J-Case) Cool Fan Low (30A); all 3 fuses Ohm-out as good. I don't have a diagram to check the relays.

What is the operation of the fans suppose to be? That-is, does only one fan come on at a particular temp then both fans activate at another temp? Or do both fans come on at a Low setting at a particular temp, then a High setting at another temp?

Before I buy another fan, I want to make sure it's not a relay or sensor issue.

shibbs · 07-07-2017, 04:28 PM

Turn the AC on, see if that kicks on one or both fans.
I've never looked at my fans running if I'm honest.

Fondue Wormhole · 07-07-2017, 06:24 PM

Quote:

Originally Posted by shibbs

Turn the AC on, see if that kicks on one or both fans.

Already did that:

Quote:

Originally Posted by Fondue Wormhole

With the engine cold & the AC on...

A little research shows that both fans work in both Lo & Hi conditions. They run in series for Lo operation, and in Parallel for Hi operation...

The relays have the connections printed on them, and they all test good as well.

Looks like I lost a fan...

Fondue Wormhole · 07-08-2017, 01:47 PM

While troubleshooting, the fan that wasn't working suddenly went on & off, which led me to the problem:

07-07-2017, 01:59 PM	#1
Fondue Wormhole Bad Example Drives: Camaro SS Join Date: Apr 2016 Location: 91311 Posts: 124	One Cooling Fan Not Working. One of my cooling fans isn't coming on. With the engine cold & the AC on, standing at the front of the car and looking in the engine bay, only the right fan comes on. With a coolant temp over 220*'s, only the right fan is on. I see in the fuse box there are 3 relays: K612 (Mini) Cool Fan HI (HC), K613 (Micro) Cool Fan Low (HC), & K614 Cool Fan CNTRL, as well as 3 fuses: #11 (Mini) Cool Fan Rly (10A), #41 (J-Case) Cool Fan HI (30A), & #44 (J-Case) Cool Fan Low (30A); all 3 fuses Ohm-out as good. I don't have a diagram to check the relays. What is the operation of the fans suppose to be? That-is, does only one fan come on at a particular temp then both fans activate at another temp? Or do both fans come on at a Low setting at a particular temp, then a High setting at another temp? Before I buy another fan, I want to make sure it's not a relay or sensor issue.

07-08-2017, 01:47 PM	#4
Fondue Wormhole Bad Example Drives: Camaro SS Join Date: Apr 2016 Location: 91311 Posts: 124	While troubleshooting, the fan that wasn't working suddenly went on & off, which led me to the problem: